Visible crew/equipment: When Lister says Kochanski was drying her tights on the radiator, keep an eye on the stars and the railings behind him. The shadow of a crew member can be seen moving on the bars and steps.
Revealing mistake: At the end of the episode when the future Lister closes the door on the Cat and Lister, you can see the partial editing out of Lister and the Cat as the door closes. As this happens, Lister and the Cat disappear before the door has passed them.
Revealing mistake: When the Cat, Lister and Kryten are walking and the Cat is complaining about rock, keep an eye on the background. They start walking just before a set of steps, then do a complete loop back to the steps for no reason.
Continuity mistake: Near the end of the episode, after the simulant has strangled itself, it is lying flat on his back. When the Cat comes up behind it to attack it with a spade, the simulant is half sitting up. 26.20.
Revealing mistake: During the Scrabble game, Lister (in Rimmer's body) jumps out of his seat and you can hear the chair scrape across the floor. As Lister is a hologram, he should not have been able to move the chair.